US11293072B2 - Process for on-line quenching of seamless steel tube using residual heat and manufacturing method - Google Patents

Process for on-line quenching of seamless steel tube using residual heat and manufacturing method Download PDF

Info

Publication number
US11293072B2
US11293072B2 US15/762,912 US201615762912A US11293072B2 US 11293072 B2 US11293072 B2 US 11293072B2 US 201615762912 A US201615762912 A US 201615762912A US 11293072 B2 US11293072 B2 US 11293072B2
Authority
US
United States
Prior art keywords
seamless steel
steel tube
tube
line quenching
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US15/762,912
Other versions
US20180265941A1 (en
Inventor
Zhonghua Zhang
Yaoheng LIU
Ke Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baoshan Iron and Steel Co Ltd
Original Assignee
Baoshan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN201510615737.9A priority Critical patent/CN105154765A/en
Priority to CN201510615737.9 priority
Priority to CN201610265674.3 priority
Priority to CN201610265674.3A priority patent/CN105907937A/en
Priority to CN201610776283.8 priority
Priority to CN201610776283.8A priority patent/CN106555045A/en
Priority to PCT/CN2016/099563 priority patent/WO2017050229A1/en
Application filed by Baoshan Iron and Steel Co Ltd filed Critical Baoshan Iron and Steel Co Ltd
Assigned to BAOSHAN IRON & STEEL CO. reassignment BAOSHAN IRON & STEEL CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIU, Yaoheng, XU, KE, ZHANG, ZHONGHUA
Publication of US20180265941A1 publication Critical patent/US20180265941A1/en
Application granted granted Critical
Publication of US11293072B2 publication Critical patent/US11293072B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling Diescher mills, Stiefel disc piercers, Stiefel rotary piercers
    • B21B19/04Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78Control of tube rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18Hardening; Quenching with or without subsequent tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62Quenching devices
    • C21D1/667Quenching devices for spray quenching
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00Process control or regulation for heat treatments
    • C21D11/005Process control or regulation for heat treatments for cooling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/005Heat treatment of ferrous alloys containing Mn
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/008Heat treatment of ferrous alloys containing Si
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085Cooling or quenching
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/002Bainite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/003Cementite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys

Abstract

An process for the on-line quenching of seamless steel tube using residual heat, a method for manufacturing a seamless steel tube, and a seamless steel tube. The process for the on-line quenching of a seamless steel tube comprises the following steps: when the temperature of a tube is higher than Ar3, evenly spraying water along a circumferential direction of the tube so as to continuously cool the tube to be not higher than T° C., the cooling rate being controlled to be E1° C./s to E2° C./s to obtain a microstructure with martensite as the main composition, wherein T=Ms−95° C., Ms represents the martensitic phase transition temperature, E1=20×(0.5−C)+15×(3.2−Mn)−8×Cr−28×Mo−4×Ni−2800×B, and E2=96×(0.45−C)+12×(4.6−Mn), and the C, Mn, Cr, Ni, B and Mo in the equations each represents the mass percentages of corresponding elements in the seamless steel tube.

Description

CROSS-REFERENCE TO RELATED APPLICATION
This application is a national stage entry pursuant to 35 U.S.C. § 371 of International Application No. PCT/CN2016/099563, filed on Sep. 21, 2016, which claims priority to Chinese Patent Application No. 201510615737.9, filed on Sep. 24, 2015, Chinese Patent Application No. 201610265674.3, filed Apr. 26, 2016, and Chinese Application No. 201610776283.8, filed Aug. 30, 2016, the contents of all of which are fully incorporated herein by reference.
FIELD
The present invention relates to a cooling process of steel tube and manufacturing method thereof, in particular to a cooling process of a seamless steel tube and a manufacturing method thereof.
BACKGROUND
In the prior art, due to product shape and manufacturing method limitations for hot-rolled seamless steel tubes, the product performance has long been improved only by addition of alloying elements and off-line heat treatment after rolling. Taking oil well tubes, for example, tubes having a degree of 555 MPa (80 Ksi) or higher requires addition of more alloying elements in manufacturing, which significantly increases the manufacturing cost. Or, tubes having a degree of 555 MPa (80 Ksi) or higher can be produced by off-line quenching heat treatment, wherein the so-called off-line quenching heat treatment means that hot-rolled seamless steel tubes are air-cooled to the room temperature after rolling, and be put into a tube bank firstly, then the pipes are heat-treated as needed. However, this method brings not only a waste of residual heat after rolling (the temperature of the steel tube after rolling is usually above 900° C.), but also a complexity of process and an increased cost. Furthermore, the tubes cannot be strengthened by off-line heat treatment using the induced phase transition effect after material deformation. According to the research, when the steel after the deformation is immediately on-line quenched, its performance is significantly higher than that of tube that is reheated and quenched after cooling.
As described above, although the skilled in the art has known that on-line quenching helps to make the seamless steel tube a better performance, the on-line quenching is still not used in the prior art. This is because the seamless steel tube, different from ordinary hot rolled steel tube, has its special section shape and has more complicated internal stress state than that of plate. If the on-line quenching process is adopted, it is difficult to control the performance steadily, and on the other hand the steel tube is likely to crack.
Invention Contents
One purpose of the present invention is to provide a cooling process for on-line quenching of seamless steel tube using residual heat, which can obtain seamless steel tube with better performance without adding large amount of alloying elements, and can prevent cracking of seamless steel tube effectively.
Based on the above invention purpose, the present invention provides a process for on-line quenching of seamless steel tube using residual heat, comprising the following steps:
when the temperature of tube is higher than Ar3, evenly spraying water along the circumferential direction of the tube so as to continuously cool the tube to be not higher than T° C., the cooling rate being controlled from E1° C./s to E2° C./s to obtain a microstructure with martensite as the main composition, wherein T=Ms−95° C., Ms represents the martensitic phase transition temperature, E1=20×(0.5−C)+15×(3.2−Mn)−8×Cr−28×Mo−4×Ni−2800×B, E2=96×(0.45−C)+12×(4.6−Mn), C, Mn, Cr, Ni, B and Mo in the equations each represent the mass percentage of corresponding elements of the seamless steel tube.
It should also be noted that, the technical solution above defines the above formula does not mean that the seamless steel tube must contain elements of C, Mn, Cr, Ni B and Mo at the same time. The equations are general and can be applied to the seamless steel tube quenched by this method. Therefore, when one or more of the elements involved in the equations is not contained, zero should substitute into the equations.
In the process for the on-line quenching of seamless steel tube using residual heat according to the present invention, the inventor of the present invention control the cracking tendency effectively of the quenched seamless steel tube by controlling the matching relationship between the material of the steel pipe and the parameters of quenching process, in particular, the quenching start cooling temperature, the final cooling temperature and the cooling rate, which will obtain a higher ratio of martensitic phase after quenching, so as to achieve the stable controlling of the final performance of seamless steel tube.
More specifically, the inventor, after extensive research, creatively proposed that continuous cooling the tube to the temperature to be not higher than T° C. and controlling the cooling speed from E1° C./s to E2° C./s, wherein T=Ms−95° C., Ms represents the martensitic phase transition temperature E1=20×(0.5−C)+15×(3.2−Mn)−8 Cr−28×Mo−4×Ni−2800×B, E2=96×(0.45−C)+12×(4.6−Mn), wherein C, Mn, Cr, Ni, B and Mo in the equations each represent the mass percentage of corresponding elements of the seamless steel tube. The cooling rate being controlled from E1° C./s to E2° C./s, which is because, when the cooling rate is less than E1, the martensite will difficult be obtained sufficiently in phase ratio after quenching, and thus cannot guarantee the final performance. When the cooling rate is higher than E2° C./s, will result to crack of seamless steel tube due to internal stress being larger after quenching
In addition, the temperature of the tube needs to be higher than the Ar3 temperature, this is because some proeutectoid ferrite forms in the seamless steel tube if the process for the on-line quenching of seamless steel tube begins at a temperature below Ar3, which cannot guarantee to obtain the amount of martensite after quenching.
It should be noted that the Ar3 temperature and the Ms temperature is known to those skilled in the art or can be obtained under technical conditions. For example, it can be obtained by referring to a manual or by thermal simulation experiment.
In addition, it should be noted that, in the above equations, C, Mn, Cr, Ni B and Mo each represents the mass percentages of corresponding elements of the seamless steel tube. That is, the numerical values of C, Mn, Cr, Ni B and Mo substituted into the equations are the numerical values before the percent %. For example, in one embodiment where C is 0.17% by mass, the substituted value of C into the equations is 0.17, rather than 0.0017. The substitution of other elements has same meaning and is not further described.
Further, process for the on-line quenching of seamless steel tube according to the present invention, the total amount of alloying elements of the seamless steel tube is not more than 5% by mass, wherein the alloying elements are at least one selected from C, Mn, Cr, Mo, Ni, B, Cu, V, Nb and Ti. If the alloying elements of the seamless steel tube exceed 5% by mass, the martensitic transformation can be carried out in air cooling conditions without using this method. In addition, the alloying element of the seamless steel tube in the present technical solution is not limited to C, Mn, Cr, Mo, Ni, B, Cu, V, Nb and Ti, and may be other alloying elements.
Further, in the process for the on-line quenching of seamless steel tube according to the present invention, the total amount of alloying elements of the seamless steel tube is 0.2% to 5% by mass.
Further, in the process for the on-line quenching of seamless steel tube according to the present invention, the phase ratio of the obtained martensite is not less than 90%, which makes the seamless steel tube has high strength and toughness, and stable performance fluctuations.
Further, the obtained microstructure by the process for the on-line quenching of seamless steel tube according to the present invention may further contain bainite, ferrite and carbide.
Compared with the prior art, the said process for the on-line quenching of seamless steel tube of the preset invention utilizes the residual heat induced the phase transition effect of the steel material after deformation, thus, does not require to add excessive alloying elements. In addition, since the formula proposed in the technical solution has high applicability, the technical solution does not specifically limit the composition ratio of the seamless steel tube. As long as the technical features defined by the technical solutions are satisfied, the technical effects can be realized by the technical solutions.
Accordingly, another purpose of the present invention is to provide a method for manufacturing a seamless steel tube using residual heat, comprising the following steps:
(1) manufacturing the billet:
(2) forming the billet into tube:
(3) cooling the tube by the process for the on-line quenching of seamless steel tube; and
(4) tempering.
It should be noted that, in step (1), the billet can be produced by casting the smelted molten steel into a round billet, or can be produced by pouring first and then forging or rolling the slab into the billet.
Further, in the method for manufacturing seamless steel tube according the present invention, in the step (4), the tempering temperature is not less than 400° C., the tempering time is not less than 30 min to ensure that the martensite can be sufficiently decomposed to obtain the tempered sorbite, so as to get better performance of seamless steel tube.
Further, in the manufacturing method for a seamless steel tube according to the present invention, in step (2), the billet is heated to 1100 to 1130° C. and maintained for 1 to 4 hours, followed by piercing, successive rolling, diameter reducing or sizing by tension, so as to obtain the tube.
In addition, another purpose of the present invention is to provide a seamless steel tube which is prepared by the method said above for manufacturing seamless steel tube.
Further, in the seamless steel tube of the present invention, the hardness thereof is higher than (58×C+27) HRC, said C represents the mass percentage of carbon in the seamless steel tube.
The process for the on-line quenching of seamless steel tube using residual heat and the method for manufacturing a seamless steel tube according to the present invention have the following advantages and beneficial effects:
(1) The process for the on-line quenching of seamless steel tube using residual heat and the method for manufacturing a seamless steel tube according to the present invention can make full use of the residual heat after the hot rolling of the seamless steel tube without reheating to make the seamless steel tube austenitized, which has a shorter production process and lower cost compared with the products obtained by off-line quenching in the prior art,
(2) The process for the on-line quenching of seamless steel tube using residual heat and the method for manufacturing a seamless steel tube according to the present invention can effectively improve the toughness of the steel pipe and greatly reduce the amount of addition of the alloying elements at the same performance level.
(3) The process for the on-line quenching of seamless steel tube using residual heat and the method for manufacturing a seamless steel tube according to the present invention can avoid the cracking phenomenon of seamless steel tube which is unavoidable in the prior art and ensure the qualified rate of the product.
(4) The process for the on-line quenching of seamless steel tube using residual heat and the method for manufacturing a seamless steel tube according to the present invention can obtain the microstructure of the seamless steel tube composed mainly by martensite, thereby ensuring the toughness and stability of the steel pipe.
DETAILED DESCRIPTION
The process for the on-line quenching of seamless steel tube using residual heat and the method for manufacturing a seamless steel tube according to the present invention will be further explained and described accompanying drawings and the specific Example as follow, and the this explanation and description shall not be deemed to limit to the technical solution of the present invention.
Examples A1-A7 and Comparative Examples B1-B5
The seamless steel tubes of the above Examples A1 to A7 were obtained by the following steps:
(1) Manufacturing the billet: smelting according to the mass percentage of each chemical element listed in Table 1, casting it into an ingot and forging the ingot into the billet.
(2) forming the billet into tube: the billet is heated to 1100° C. to 1130° C. and maintained for 1 to 4 hours, followed by piercing, rolling, stretch reducing or sizing, so as to obtain the tube.
(3) use the process for the on-line quenching of seamless steel tube using residual heat: when the temperature of tube is higher than Ar3, evenly spraying water along the circumferential direction of the tube so as to continuously cool the tube to be not higher than T° C., the cooling rate being controlled from E1° C./s to E2° C./s to obtain a microstructure with martensite as the main composition, wherein T=Ms−95° C., Ms represents the martensitic phase transition temperature, E1=20×(0.5−C)+15×(3.2−Mn)−8×Cr−28×Mo−4×Ni−2800×B. E2=96×(0.45−C)+12×(4.6−Mn), C, Mn, Cr, Ni, B and Mo in the equations each represent the mass percentage of corresponding elements of the seamless steel tube.
(4) tempering: the tempering temperature is not less than 400° C., the tempering time is not less than 30 min.
In order to demonstrate the implementation effect of the online-control cooling process of the present invention, the process steps of manufacturing the billet and the tube for Comparative Example B1-B5 are the same as that for Example of the invention, whereas the process parameters of control cooling process for Comparative Example B1-B5 are outside the protection scope of the present technical solution. In addition, the treatment of the tube in the Comparative Example is not the on-line quenching, but completely cooled to room temperature and then heated to Ar3 and then began to quench.
Table 1 lists each mass percentage of the chemical elements of the seamless steel tubes of Examples A1 to A7 and Comparative Examples B1 to B5.
TABLE 1
(wt %, the margin is Fe and other unavoidable impurity elements)
Steel
No. model C Mn Cr Mo B Ni
A1 16Mn 0.17 1.65
A2 20Mn2 0.2 1.6
A3 20Mn2 0.2 1.6
A4 30CrMo 0.3 0.45 1.05 0.23
A5 30CrMo 0.3 0.45 1.05 0.23
A6 20Mn2B 0.21 1.64 0.0025
A7 20CrNi 0.2 0.55 0.9  1.05
B1 20Mn2 0.2 1.6
B2 20Mn2 0.2 1.6
B3 20Mn2 0.2 1.6
B4 20Mn2 0.2 1.6
B5 30CrMo 0.3 0.45 1.05 0.23
Table 2 lists the specific process parameters for the methods for manufacturing seamless steel tube of Examples A1-A7 and Comparative Examples B1-B5.
TABLE 2
Start Final
Heating Ar3 cooling cooling The phase ratio tempering
temper- heating temper- temper- temper- Cooling of the martensite temper- tempering
ature time ature ature Ms T ature E1 E2 rate after quenching ature time
No. (° C.) (h) (° C.) (° C.) (° C.) (° C.) (° C.) (° C./s) (° C./s) (° C./s) (%) (° C.) (min)
A1 1150 1.4 835 930 410 315 220 29.85 62.28 61 94 500 60
A2 1250 2.5 740 920 400 305 290 30 60 42 96 450 45
A3 1200 2 740 880 400 305 120 30 60 38 98 550 50
A4 1280 2.8 763 960 345 250 190 30.41 64.2 34 92 620 70
A5 1140 3.5 763 830 345 250 200 30.41 64.2 44 95 640 80
A6 1260 2.5 736 970 270 175 160 22.2 58.56 36 93 660 35
A7 1220 3 750 920 410 315 265 48.75 72.6 64 96 580 45
B1 1250 2 740 725 400 305 100 30 60 48 42 500 60
B2 1250 2 740 860 400 305 250 30 60 24 38 450 60
B3 1250 2 740 940 400 305 380 30 60 46 26 550 60
B4 1250 2 740 800 400 305 180 30 60 66
B5 1250 2 763 890 345 250 160 30.41 64.2 70
Various performance tests were conducted on the seamless steel tubes of Example A1-A7 and Comparative Example B1-B5, and the results are shown in Table 3. Wherein the yield strength data are average value obtained according to the API standard after the seamless steel tube of Example A1-A7 and the seamless steel tube of Comparative Example B1-B6 are processed into API arc-shaped samples. The impact sample was test by the standard impact sample of the seamless steel tube of Example A1-A7 and Comparative Example B1 to B6 processed into 10 mm*10 mm*55 mm size, V-notch at 0° C. In addition, the hardness after quenching cooling of each Example and Comparative Example was measured by a Rockwell hardness test.
Table 3 lists the seamless steel tube performance data for each of the Examples and Comparative Examples.
Impact
HRC Yield energy
hardness Strength (full size
after Crack/ Rp0.2 sample)
No. quenching yes or no (MPa ) at 0° C. (J)
A1 39 no 492 185
A2 42 no 785 106
A3 44 no 645 118
A4 46 no 798 162
A5 49 no 762 177
A6 43 no 606 154
A7 42 no 672 148
B1 35 no 421 167
B2 33 no 596 98
B3 33 no 568 112
B4 yes
B5 yes
As can be seen from Table 2, the phase ratio of martensite of the seamless steel tubes for all Examples A1-A7 is ≥90% after the on-line quenching. As can be seen from Table 3, the yield strength of the seamless steel tubes for Examples A1-A7 is ≥492 MPa, the impact energy at 0° C. thereof are all higher than 106J. and the hardness of HRC after quenching are higher than 39, and there is no creaking.
As can be seen from Table 2 and Table 1, the component ratios of the chemical elements for all Example and Comparative Example have no difference, but the method for manufacturing of the Example and Comparative Example are significantly different. Therefore, the performance of the seamless tube of Example A1-A7 is superior to that of Comparative Example B1-B6 overall. In addition, as can be seen from Table 2 and Table 3, the quenching starting temperature of Comparative Example B1 is lower than the Ar3 temperature so that the steel of Comparative Example B1 precipitates proeutectoid ferrite, reducing its hardness after quenching and affecting the strength of seamless steel tube also. The cooling rate of Comparative Example B2 is lower than the cooling rate range defined in the present technical solution, and the final cooling temperature of Comparative Example B3 was higher than the T° C. of the present invention, thus the desired microstructure with high ratio of martensite of seamless steel tube could not be obtained in Comparative Example B2 and B3, which will affect the performance. In addition, the cooling rate of Comparative Example B4 is higher than the cooling rate range defined in the present technical solution, so that the steel tube cracked, and no suitable steel tube can be obtained.
It is to be noted that the above Example are only a specific embodiments of the present invention. Apparently, the invention is not limited to the above embodiments, and there are may be many similar variations. A person skilled in the art can directly derive or associate all the variations from the content disclosed by the invention, all of which shall be covered by the protection scope of the invention.

Claims (7)

The invention claimed is:
1. A process for the on-line quenching of seamless steel tube using residual heat, consisting of the following steps:
cooling the tube when the temperature of tube is higher than Ar3 by spraying water evenly along the circumferential direction of the tube so as to continuously cool the tube to be at least 120° C. but not higher than a threshold temperature that is 95° C. less than the martensitic phase transition temperature, ceasing cooling before the tube reaches a temperature of lower than 120° C.,
wherein the cooling rate is controlled to be between a range of E1° C./s and E2° C./s that is based on the mass percentage of corresponding elements of the seamless steel tube to obtain a microstructure with martensite as the main composition,
wherein

E1=20×(0.5−C)+15×(3.2−Mn)−8×Cr−28×Mo−4×Ni−2800×B,

E2=96×(0.45−C)+12×(4.6−Mn), and
wherein C, Mn, Cr, Ni, B and Mo in the equations each represent the mass percentage of corresponding elements of the seamless steel tube, and
wherein the seamless steel tube comprises the following composition by mass percentage:
C: 0.17%-0.3%, Mn: 0.45%-1.65%, Cr: 0-1.05%, Mo: 0-0.23%, B: 0-0.0025%, and Ni: 0-1.05%.
2. The process for the on-line quenching of seamless steel tube according to claim 1, wherein the total amount of alloying elements of the seamless steel tube is not more than 5% by mass, said alloying elements being at least one selected from C, Mn, Cr, Mo, Ni, Cu, V, Nb and Ti.
3. The process for the on-line quenching of seamless steel tube according to claim 2, wherein the total amount of alloying elements of the seamless steel tube is 0.2% to 5% by mass.
4. The process for the on-line quenching of seamless steel tube according to claim 1, wherein the phase ratio of martensite is not less than 90%.
5. A method for manufacturing a seamless steel tube using residual heat, comprising the following steps:
(1) manufacturing the billet;
(2) forming the billet into tube;
(3) cooling the tube by the process for the on-line quenching of seamless steel tube according to claim 1; and
(4) tempering.
6. The method for manufacturing seamless steel tube according to claim 5, wherein in the step (4), the tempering temperature is not less than 400° C., the tempering time is not less than 30 min.
7. The method for manufacturing seamless steel tube according to claim 5, wherein in the step (2), the billet is heated to 1100° C. to 1300° C., maintained for 1-4 hours, followed by piercing, successive rolling, stretch reducing or sizing, so as to obtain the tube.
US15/762,912 2015-09-24 2016-09-21 Process for on-line quenching of seamless steel tube using residual heat and manufacturing method Active 2037-01-18 US11293072B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
CN201510615737.9A CN105154765A (en) 2015-09-24 2015-09-24 Seamless steel tube with high strength and toughness and manufacturing method thereof
CN201510615737.9 2015-09-24
CN201610265674.3 2016-04-26
CN201610265674.3A CN105907937A (en) 2016-04-26 2016-04-26 Manufacturing method for bainite high-strength seamless steel tube and bainite high-strength seamless steel tube
CN201610776283.8A CN106555045A (en) 2015-09-24 2016-08-30 A kind of seamless steel pipe press quenching cooling technique and manufacture method of utilization waste heat
CN201610776283.8 2016-08-30
PCT/CN2016/099563 WO2017050229A1 (en) 2015-09-24 2016-09-21 Process for on-line quenching of seamless steel tube using waste heat and manufacturing method

Publications (2)

Publication Number Publication Date
US20180265941A1 US20180265941A1 (en) 2018-09-20
US11293072B2 true US11293072B2 (en) 2022-04-05

Family

ID=58418385

Family Applications (4)

Application Number Title Priority Date Filing Date
US15/762,929 Abandoned US20180298459A1 (en) 2015-09-24 2016-09-21 Online-control cooling process for seamless steel tube for effectively refining grains and the method for manufacturing thereof
US15/762,660 Active US11015232B2 (en) 2015-09-24 2016-09-21 Seamless steel tube with high strength and toughness and manufacturing method therefor
US15/762,912 Active 2037-01-18 US11293072B2 (en) 2015-09-24 2016-09-21 Process for on-line quenching of seamless steel tube using residual heat and manufacturing method
US15/762,810 Active 2037-07-09 US11203794B2 (en) 2015-09-24 2016-09-21 Method for manufacturing bainite high-strength seamless steel tube, and bainite high-strength seamless steel tube

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US15/762,929 Abandoned US20180298459A1 (en) 2015-09-24 2016-09-21 Online-control cooling process for seamless steel tube for effectively refining grains and the method for manufacturing thereof
US15/762,660 Active US11015232B2 (en) 2015-09-24 2016-09-21 Seamless steel tube with high strength and toughness and manufacturing method therefor

Family Applications After (1)

Application Number Title Priority Date Filing Date
US15/762,810 Active 2037-07-09 US11203794B2 (en) 2015-09-24 2016-09-21 Method for manufacturing bainite high-strength seamless steel tube, and bainite high-strength seamless steel tube

Country Status (4)

Country Link
US (4) US20180298459A1 (en)
EP (4) EP3354755B1 (en)
JP (4) JP2018532885A (en)
CN (4) CN106555042A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106555042A (en) * 2015-09-24 2017-04-05 宝山钢铁股份有限公司 A kind of seamless steel pipe On-line Control cooling technique and manufacture method of effective crystal grain thinning
CN109576568A (en) * 2017-09-28 2019-04-05 宝山钢铁股份有限公司 A kind of high-strength weldable casing and its manufacturing method
CN110317994B (en) * 2018-03-30 2021-12-17 宝山钢铁股份有限公司 Ultrahigh-strength steel for high heat input welding and manufacturing method thereof
TWI719750B (en) * 2019-12-10 2021-02-21 金允成企業股份有限公司 Forging and forming method of aluminum alloy pipe fittings
CN113637890A (en) * 2020-04-27 2021-11-12 宝山钢铁股份有限公司 Ultra-fine grain seamless steel pipe and manufacturing method thereof
CN111850422B (en) * 2020-04-30 2022-01-11 中科益安医疗科技(北京)股份有限公司 High-nitrogen nickel-free austenitic stainless steel seamless thin-walled tube and preparation method thereof
CN111840659B (en) * 2020-04-30 2022-02-08 中科益安医疗科技(北京)股份有限公司 High-safety blood vessel support without nickel metal medicine elution and its making method
CN111979382B (en) * 2020-09-03 2021-12-10 衡阳华菱钢管有限公司 Large-caliber thin-wall seamless steel pipe and preparation method thereof
CN113600637B (en) * 2021-06-30 2022-04-15 北京科技大学 Seamless steel pipe and preparation method thereof

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1502425A (en) 2002-11-25 2004-06-09 宝山钢铁股份有限公司 Method for mfg of high-quality seamless steel pipe
JP2007031756A (en) 2005-07-25 2007-02-08 Sumitomo Metal Ind Ltd Method for producing seamless steel tube
CN1951589A (en) 2006-11-21 2007-04-25 东北大学 A seamless steel pipe on-line cooling method
CN101157096A (en) 2007-11-16 2008-04-09 天津钢管集团股份有限公司 Technique of controlling and cooling hot-rolled seamless tube online
JP2008266700A (en) 2007-04-18 2008-11-06 Nippon Steel Corp High-strength steel tube for machine structure, and method for producing the same
CN101928889A (en) 2009-06-23 2010-12-29 宝山钢铁股份有限公司 Steel for resisting sulfide corrosion and manufacturing method thereof
US20120042992A1 (en) 2009-03-30 2012-02-23 Sumitomo Metal Industries, Ltd. Method for manufacturing seamless pipes
CN102618791A (en) 2012-04-23 2012-08-01 天津商业大学 High strength and ductility oil casing with hydrogen sulfide corrosion resistance and manufacturing method for oil casing
CN104831175A (en) 2014-11-25 2015-08-12 宝鸡石油钢管有限责任公司 J55-steel-grade SEW expandable casing tube and manufacturing method thereof
CN105039863A (en) 2015-09-02 2015-11-11 山西太钢不锈钢股份有限公司 Manufacturing method of martensite stainless steel seamless tube for oil well
CN105154765A (en) 2015-09-24 2015-12-16 宝山钢铁股份有限公司 Seamless steel tube with high strength and toughness and manufacturing method thereof

Family Cites Families (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0143008B2 (en) * 1981-07-28 1989-09-18 Sumitomo Metal Ind
JPS5819439A (en) * 1981-07-28 1983-02-04 Sumitomo Metal Ind Ltd Production of high strength steel pipe having excellent low temperature toughness
JPS59150019A (en) * 1983-02-14 1984-08-28 Sumitomo Metal Ind Ltd Production of seamless steel pipe having high toughness
JPS6216250B2 (en) * 1983-09-21 1987-04-11 Kawasaki Steel Co
JP2967886B2 (en) 1991-02-22 1999-10-25 住友金属工業 株式会社 Low alloy heat resistant steel with excellent creep strength and toughness
JPH06145793A (en) * 1992-10-29 1994-05-27 Sumitomo Metal Ind Ltd Method for preventing decarburization of seamless steel tube
JPH0741855A (en) * 1993-07-26 1995-02-10 Nippon Steel Corp Production of low yield radio and high toughness seamless steel pipe showing metallic structure essentially consisting of fine-grained ferrite
JP3503211B2 (en) * 1994-09-30 2004-03-02 住友金属工業株式会社 Manufacturing method of high strength seamless steel pipe
JPH09235617A (en) * 1996-02-29 1997-09-09 Sumitomo Metal Ind Ltd Production of seamless steel tube
EP0995809B1 (en) * 1997-09-29 2004-02-04 Sumitomo Metal Industries Limited Steel for oil well pipes with high wet carbon dioxide gas corrosion resistance and high seawater corrosion resistance, and seamless oil well pipe
JP3849438B2 (en) * 2001-03-09 2006-11-22 住友金属工業株式会社 Oil well steel pipe for expansion
JP2003013130A (en) * 2001-06-26 2003-01-15 Sumitomo Metal Ind Ltd Method of manufacturing billet for producing steel pipe, and method of manufacturing steel pipe for line pipe
JP4510677B2 (en) * 2005-03-28 2010-07-28 新日本製鐵株式会社 Steel pipe for ring gear material
JP4945946B2 (en) * 2005-07-26 2012-06-06 住友金属工業株式会社 Seamless steel pipe and manufacturing method thereof
CN100494462C (en) 2006-05-30 2009-06-03 宝山钢铁股份有限公司 110Ksi grade CO2 H2S corrosion-proof oil well pipe and manufacturing method
CN101328559B (en) * 2007-06-22 2011-07-13 宝山钢铁股份有限公司 Steel for low yield ratio petroleum case pipe, petroleum case pipe and manufacturing method thereof
CN101658879A (en) * 2008-08-27 2010-03-03 宝山钢铁股份有限公司 Method for manufacturing seamless steel pipe
CN101829679B (en) * 2009-03-09 2013-09-04 鞍钢股份有限公司 Production method for producing shock toughness of pipe coupling material of hot rolled oil well
CA2785425C (en) * 2010-01-27 2014-06-03 Sumitomo Metal Industries, Ltd. Method for manufacturing seamless steel pipe for line pipe and seamless steel pipe for line pipe
KR101471730B1 (en) * 2010-03-05 2014-12-10 신닛테츠스미킨 카부시키카이샤 High-strength seamless steel pipe for mechanical structure which has excellent toughness, and process for production of same
FI20115702A (en) 2011-07-01 2013-01-02 Rautaruukki Oyj PROCEDURE FOR MANUFACTURING HIGH-STRENGTH STRUCTURAL STEEL AND HIGH-STRENGTH STRUCTURAL STEEL PRODUCT
WO2014034737A1 (en) * 2012-08-29 2014-03-06 新日鐵住金株式会社 Seamless steel pipe and method for producing same
JP5928394B2 (en) * 2013-03-29 2016-06-01 Jfeスチール株式会社 Steel structure for hydrogen excellent in hydrogen embrittlement resistance in high-pressure hydrogen gas, hydrogen pressure accumulator, and method for producing hydrogen line pipe
AR096272A1 (en) * 2013-05-31 2015-12-16 Nippon Steel & Sumitomo Metal Corp SEAMLESS STEEL TUBE FOR DRIVING PIPES USED IN AGRICULTURAL ENVIRONMENTS
CN103290324A (en) * 2013-06-20 2013-09-11 衡阳华菱钢管有限公司 Fine-grain ferrite + pearlite type N80-1 non-quenched and tempered seamless oil bushing, and production method thereof
CN103741028B (en) * 2013-12-31 2016-04-13 攀钢集团成都钢钒有限公司 Low yield strength ratio low temperature weldless steel tube and production method thereof
CN103866203B (en) * 2014-01-15 2016-08-17 扬州龙川钢管有限公司 A kind of heavy caliber high-strength bridge seamless steel pipe and TMCP production method thereof
JP6225795B2 (en) 2014-03-31 2017-11-08 Jfeスチール株式会社 Manufacturing method of thick high-strength seamless steel pipe for line pipe with excellent resistance to sulfide stress corrosion cracking
JP6070617B2 (en) * 2014-04-03 2017-02-01 Jfeスチール株式会社 Seamless steel pipe for fuel injection pipes with excellent internal pressure fatigue resistance
CN103938094B (en) * 2014-04-28 2016-08-24 宝山钢铁股份有限公司 A kind of ultrahigh-intensity high-toughness petroleum casing pipe and manufacture method thereof
CN104294156B (en) * 2014-09-05 2016-06-08 武汉钢铁(集团)公司 A kind of economy the excellent high-carbon wear-resistant steel pipe of processing characteristics and production method
RU2673262C1 (en) * 2014-12-12 2018-11-23 Ниппон Стил Энд Сумитомо Метал Корпорейшн Low-alloy steel for pipe for oil well and method for production of pipe for oil well from low-alloy steel
JP5943165B1 (en) * 2014-12-24 2016-06-29 Jfeスチール株式会社 High strength seamless steel pipe for oil well and method for producing the same
CN104878307A (en) * 2015-04-30 2015-09-02 内蒙古包钢钢联股份有限公司 Production method of bainite wear-resistance hot-rolled seamless steel pipe
CN106555042A (en) * 2015-09-24 2017-04-05 宝山钢铁股份有限公司 A kind of seamless steel pipe On-line Control cooling technique and manufacture method of effective crystal grain thinning
CN105907937A (en) * 2016-04-26 2016-08-31 宝山钢铁股份有限公司 Manufacturing method for bainite high-strength seamless steel tube and bainite high-strength seamless steel tube

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1502425A (en) 2002-11-25 2004-06-09 宝山钢铁股份有限公司 Method for mfg of high-quality seamless steel pipe
JP2007031756A (en) 2005-07-25 2007-02-08 Sumitomo Metal Ind Ltd Method for producing seamless steel tube
US20080121318A1 (en) 2005-07-25 2008-05-29 Yuji Arai Method for producing seamless steel pipe
CN1951589A (en) 2006-11-21 2007-04-25 东北大学 A seamless steel pipe on-line cooling method
JP2008266700A (en) 2007-04-18 2008-11-06 Nippon Steel Corp High-strength steel tube for machine structure, and method for producing the same
CN101157096A (en) 2007-11-16 2008-04-09 天津钢管集团股份有限公司 Technique of controlling and cooling hot-rolled seamless tube online
CN102365376A (en) 2009-03-30 2012-02-29 住友金属工业株式会社 Method for producing seamless steel pipe
US20120042992A1 (en) 2009-03-30 2012-02-23 Sumitomo Metal Industries, Ltd. Method for manufacturing seamless pipes
CN101928889A (en) 2009-06-23 2010-12-29 宝山钢铁股份有限公司 Steel for resisting sulfide corrosion and manufacturing method thereof
CN102618791A (en) 2012-04-23 2012-08-01 天津商业大学 High strength and ductility oil casing with hydrogen sulfide corrosion resistance and manufacturing method for oil casing
CN104831175A (en) 2014-11-25 2015-08-12 宝鸡石油钢管有限责任公司 J55-steel-grade SEW expandable casing tube and manufacturing method thereof
CN105039863A (en) 2015-09-02 2015-11-11 山西太钢不锈钢股份有限公司 Manufacturing method of martensite stainless steel seamless tube for oil well
CN105154765A (en) 2015-09-24 2015-12-16 宝山钢铁股份有限公司 Seamless steel tube with high strength and toughness and manufacturing method thereof

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
ASM datasheet for 4130/4135/4137, 33CrMo4, DIN. 2018. (Year: 2018). *
Canale et al. "Problems Associated with Heat Treating." ASM Handbook, vol. 4B, Steel Heat Treating Technologies. pp. 29-73. 2014. (Year: 2014). *
Feng, Xuejun et al., "Practice of on-line Water quenching Heat treatment for Steel Tubes", Tianjin Metallurgy, Dec. 31, 2005, No. 129, pp. 44-46.
Tao, Xuezhi et al., "On-line Heat Treatment Process for Steel Pipe with Water Quenching", Steel Pipe, Apr. 30, 2006, vol. 35, No. 2, 5 pages.
Van Bohemen, SMC , "Bainite and martensite start temperature calculated with exponential carbon dependence", Materials Science and Technology, 2012, vol. 28(4), pp. 487-495, abstract only.

Also Published As

Publication number Publication date
EP3354755B1 (en) 2021-05-19
US11203794B2 (en) 2021-12-21
JP6829717B2 (en) 2021-02-10
EP3354755A1 (en) 2018-08-01
EP3354756B1 (en) 2021-01-20
EP3354755A4 (en) 2019-03-06
EP3354763A4 (en) 2019-03-06
EP3354763A1 (en) 2018-08-01
JP2018532883A (en) 2018-11-08
US20180282833A1 (en) 2018-10-04
CN106555045A (en) 2017-04-05
JP6574307B2 (en) 2019-09-11
EP3354757A1 (en) 2018-08-01
US20180298459A1 (en) 2018-10-18
US20180274054A1 (en) 2018-09-27
JP2018534417A (en) 2018-11-22
EP3354757A4 (en) 2019-03-13
CN106555042A (en) 2017-04-05
CN106555107B (en) 2018-11-06
CN106555113A (en) 2017-04-05
JP2018532885A (en) 2018-11-08
CN106555107A (en) 2017-04-05
EP3354756A4 (en) 2019-05-01
JP6586519B2 (en) 2019-10-02
US11015232B2 (en) 2021-05-25
US20180265941A1 (en) 2018-09-20
JP2018532884A (en) 2018-11-08
CN106555113B (en) 2018-09-04
EP3354756A1 (en) 2018-08-01

Similar Documents

Publication Publication Date Title
US11293072B2 (en) Process for on-line quenching of seamless steel tube using residual heat and manufacturing method
EP3715478B1 (en) Wire rod for cold heading, processed product using same, and manufacturing method therefor
CN106636943B (en) Elongation percentage A50.8>=48% thin gauge high tensile pipeline steel and its production method
US20180291475A1 (en) Ultra-high strength and ultra-high toughness casing steel, oil casing, and manufacturing method thereof
CN103147010B (en) Hydrogen and hydrogen sulphide corrosion resistant steel forged piece and production process thereof
CN102191437B (en) Seamless steel tube for petroleum cracking and heat treatment method thereof
CN105506249A (en) Heat treatment method for high-nitrogen corrosion resistant plastic die steel
CN105154765A (en) Seamless steel tube with high strength and toughness and manufacturing method thereof
CN109972042A (en) A kind of yield strength 800MPa grades of Low temperature-resistancorrosion-resistant corrosion-resistant H profile steels and preparation method thereof
CN104372261A (en) High-ductility X80 pipeline steel plate for alpine region and production method of high-ductility X80 pipeline steel plate
CN107012398A (en) A kind of Nb-microalloying TRIP steel and preparation method thereof
CN102383059A (en) Hot rolled transformation induced plasticity (TRIP) steel and preparation method thereof
CN104073744B (en) The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method
CN103131843B (en) Stabilization continuous annealing process of low-alloy and high-strength steel cold-rolled sheet used for automobile structural components
CN107227425B (en) Cold-heading carbon steel wire rod with high, processed goods and their manufacturing method using this
WO2017050229A1 (en) Process for on-line quenching of seamless steel tube using waste heat and manufacturing method
WO2017050227A1 (en) Seamless steel tube with high strength and toughness and manufacturing method therefor
CN105950971B (en) A kind of yield strength >=960MPa levels steel for engineering machinery and production method
WO2017050230A1 (en) Online-controlled seamless steel tube cooling process and seamless steel tube manufacturing method with effective grain refinement
CN113930675A (en) 2200 MPa-grade low-carbon B-free hot forming steel and preparation method thereof
CN113699337A (en) Heat treatment process for continuous casting large round billet of 9Cr heat-resistant steel
WO2017050228A1 (en) Method for manufacturing bainite high-strength seamless steel tube, and bainite high-strength seamless steel tube
JPH05263134A (en) Production of low-chromium martensitic stainless steel tube excellent in toughness at low temperature

Legal Events

Date Code Title Description
FEPP Fee payment procedure

Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

AS Assignment

Owner name: BAOSHAN IRON & STEEL CO., CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ZHANG, ZHONGHUA;LIU, YAOHENG;XU, KE;REEL/FRAME:046137/0462

Effective date: 20180402

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STCB Information on status: application discontinuation

Free format text: FINAL REJECTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STCB Information on status: application discontinuation

Free format text: FINAL REJECTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE AFTER FINAL ACTION FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: ADVISORY ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED

STCF Information on status: patent grant

Free format text: PATENTED CASE